Hostname: page-component-848d4c4894-2pzkn Total loading time: 0 Render date: 2024-05-28T18:50:32.868Z Has data issue: false hasContentIssue false
  • English
  • Français

Influences of Silicon and Phosphorus Contents and Cooling Rate on JIC Fracture Toughness of Ferritic Spheroidal Graphite Cast Iron

Published online by Cambridge University Press:  21 February 2011

Shinichiro Komatsu  and
Toshio Shiota
Shinichiro Komatsu
Affiliation:
Kinki University, Faculty of Engineering; 1000 Hiro, Kure, Hiroshima, 737-01, Japan
Toshio Shiota
Affiliation:
Kinki University, Faculty of Engineering; 1000 Hiro, Kure, Hiroshima, 737-01, Japan
Get access

Abstract

The influences of silicon and phosphorus contents and cooling rate on JIC fracture toughness of ferritic spheroidal graphite cast iron were investigated by 15mm thick compact tension test-pieces. The JIC values were measured by means of the R-curve method for most cases at 20°C, and by means of the maximum J value method for the cases at -100° C. The results obtained are summarized as follows. At 20WC, the specimens with silicon contents less than 3.2% showed the ductile Load-COD relations, but a specimen with 3.5%Si showed a brittle Load-COD relation and the JIC decreased greatly. Increasing phosphorus content between 0.006% and 0.26% made the JIC value decrease gradually and made the slope of the R-curve decrease greatly. Difference in cooling rate produced differences in graphite nodule diameters and ferrite grain sizes. At 20°C, the larger the specimen's average graphite nodule diameter was, the larger the JIC value was. At -100° C, the Jic values of all the specimens tested decreased largely, and the influences of these factors became very different from those at 20° C.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 34: Symposium – Physical Metallurgy of Cast Iron , 1984 , 517
Copyright
Copyright © Materials Research Society 1985

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. ASTM E399-81Google Scholar
2. Bladley, W.l. and Moad, H.E., ICM 3, 19–26 (1979)Google Scholar
3. Worzala, F.J., et.al, AFS Trans., 76, 675–682 (1976)Google Scholar
4. Nanstad, R.K., et.al, AFS Trans., 75, 245–256 (1975)Google Scholar
5. Jolley, G. and Holdsworth, S.R., 4th ICF (Waterloo,Canada),2,403–413 (1977)Google Scholar
6. Niskanen, J., AFS Int.Cast Metals J.,2, 7, 20–22 (1977)Google Scholar
7. Chi, Xu and Rui-zhen, Yu, AFS Int. Cast Metals J., Sept. 21-28 (1979)Google Scholar
8. Motz, J.M., Giesseri, 67, 628–637 (1980)Google Scholar
9. Little, A. and Heine, H.J., Proc. 2nd Int. Symp. on Metallurgy of Cast Iron, 767–788 (1974)Google Scholar
10. Schofielf, R., Int. J. Pres. & Piping, 5, 73–82 (1977)10.1016/0308-0161(77)90019-9CrossRefGoogle Scholar
11. JSME S001-81Google Scholar
12. ASTM E813-81Google Scholar
13. Bladley, W.D., ASME MPC, No.11, 69–87 (1979)CrossRefGoogle Scholar
14. Andoh, H. and Iwadate, T., Proc. 29th Japan National Symp. on Strength, Fracture and fatigue, 29, 13–30 (1984)Google Scholar
15. Konatsu, S., Shiota, T. and Nakamura, K., J. Japan Foundrymen's Society, 56, No.3, 170–175 (1984)Google Scholar